Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b64eef1528b8aeb…

MALICIOUS

PDF

77.8 KB Created: 2020-11-23 16:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4940d7b78d82f5f9aee6dc2b06997e59 SHA-1: 3bbb6de9735695266d372ddd8a46b41c30dfbbb1 SHA-256: 9b64eef1528b8aeb66d5a3aa772ba0c85e24c0574970b858da32cf177f8d7258
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/strik?utm_term=31948+du+ciel+ce+bonsall+ca+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f95313b8f67e.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/letuko-pewejitiwa-wowiton-kejesijewos.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/2144949.pdfIn PDF document text
    • https://lawijafixome.weebly.com/uploads/1/3/4/5/134588346/navirabufeja.pdfIn PDF document text
    • https://vajuwapokovis.weebly.com/uploads/1/3/4/3/134361820/591383.pdfIn PDF document text
    • https://jomixemaletid.weebly.com/uploads/1/3/4/6/134659672/sodeja_wotefurosavuf_mumufokotiwus_nolerede.pdfIn PDF document text
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/5418839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f9c426129cec.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/9750844.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/1946785.pdfIn PDF document text
    • https://jumosoguwakebak.weebly.com/uploads/1/3/4/5/134588816/rumaz_ruzexif_daderuluduju_favonenajiwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/ghana_afrobeat_music.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/chair_gym_workout_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9745b9-4536-4dd2-a3d5-b560cdf8ce75/welegavovuvamenemuxire.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5824 bytes
SHA-256: 0097bbe53e9ecaa204d3172caeb35740218d0e778971aa5e05ff40abb96ed50f
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 13208 bytes
SHA-256: 1f48591d4ddacd76d18d5c6759213851ca85e71355378ac60dc8deacca0cbc31

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